Step motor control, by pulse by changing the order of electricity can change the motor rotation direction, change the pulse frequency can change the motor rotation speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Stepping motor control by pulse, by changing the order of power to change the direction of rotation motor, change the pulse frequency may change the motor rotation speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
By changing the speed of grinding wheel, its swing frequency and the feed speed of shaft direction, different experiment results were got.
通过改变砂轮转速、砂轮摆动频率、轴向进给量，获得了一些具有对比性的试验结果。
Experiment showed control the direction of laser could be controlled by changing ultrasonic frequency.
实验证明，通过改变超声频率可实现对激光光束方向的控制。
Experiment showed control the direction of laser could be controlled by changing ultrasonic frequency.
实验证明，通过改变超声频率可实现对激光光束方向的控制。
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